There are many great writers on this site, and all of you receive our thanks for your passion and your toil to bring these stories to us. We may not say it on an ongoing regular basis, but THANK YOU TO ALL OF THE WRITERS HERE.
As to the "best" on this site, that is obviously subjective, as one person's "great" is another person's "yawn". I like a longer story, both for the fight scene itself and the set-up to why the fight is happening and the reasons and emotions behind the battle. Finally, I like a competitive, back and forth battle and not a domination from start to finish.
My current favorites would be (in no particular order), Anna the Marine Chick, Sidekick, and AndrewScott as the most consistently enjoyable. Also a couple nods to harpua13 (for the Luxana stoires), Jonica (for "A Clockwork Strawberry", maybe the best full story on the site), Catharsis (for "Homewrecker"), the late Braveheart (for his Sandbridge saga), and the Raven (who created probably the first great saga, Cat Scratch Fever and its sequel, Corporate Catfighting, over 20 years ago!--you will have to go elsewhere to find copies of his stories.) The older writers (Howard Cossell, Pecavvi, The Scribbler, Gemma Rox, Jonica, Laurie Breeze, and many others) are also well worth your efforts to dig back into the archives and find their great work as well.
Once again, thank you to all the writers here.